I've had the same problem with my CRV, fortunately Honda finally replaced it under warranty. They figured the housing was cracked or a faulty seal between the housing and clear lens.
I was able to get the condensation out initially by taking the bulbs out and parked the vehicle facing into the sun on hot dry day, but that was only temporary. If the water/moisture came in when a bulb and seal were out, this could be a solution, but if the moisture is coming in through a break in the housing, that's a different story.
The clear lens is permanently bonded to the housing, so do not even try to separate the lens from the housing. If you can remove the assembly, check for obvious breaks or pressure test for leaks and seal if you find one. To test, seal openings and blow air in and spray water on outside of housing and lens.
If it was broken during the engine repair, nicely ask the dealer if they will replace. You may have to google numbers on the lens or call Winnebago to see where they purchased the assembly.
Ken
